Process of treatment of clay chalk.



JOHN N. SHYMANSKI', OF LOUISVILLE, KENTUCKY.

v PROCESS OF TREATMENT OF CLAY CHALK.

may concern-:' known that I, J OHN N; SHYMANsKI, acitizen of v county of Jefferson and State of Kentucky, haveinvented a new'and Improved Process of Treatment of Clay Chalk, of which" the following is a full, clear, and

exact description.- v

I This invention has reference to improvements in the process of treating the material commonly known as H chalk; as usedfor marking purposes by tailors and 1 7' 'ers. I

drama the form of thin, rectangular pieces tapers's section at both sides, providing opposite These edges after slight use in marke dull or break and require frequent sharpening, owing to the soft, brittle and fragile character-of the clay chalk. These qualities of the chalk also render it easily broken when dropped on the table, floor,

etc. or in anywise roughly handled. I have discovered Q a treatment for this clay chalk, which, while not impairing its marking qualities, largely removes its fragile and soft character, rendering it tough and capable of taking a sharp marking edge and holding it much longer when in use for marking purposes, than the commercial article.

My improved treatment consists in taking the clay chalk, preferably in the form as now sold for marking purposes, and soaking it in machine oil. This soaking Specification of Letters Patent. Application filed January 15, 1907. Serial No. 352.400.

'- the Un'it'e d States, and'a resident of Louisville, in the' 's chalk is usually placed on the market for Patented July 9, 1907.

should continue until the chalk has become thoroughly saturated, the time required for this operation depending upon the thickness of the pieces which the oil is to I penetrate; for ordinary thicknesses a days soaking will be found sufficient. After the soaking oi the chalk in the oil is complete, it is removed and placed in a suitable position to dry. When the chalk is thoroughly dry, it is ready for use in the ordinary manner. It will be found that While its use as a marker is in no wise rendered inferior by the treatment, it has lost practically'all of the features of disadvantage of the ordinary commercial marker. 40

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1: The herein described process of treating clay chalk for marking and other purposes, which consists in soaking it in oil and thereafter permittingthe same to dry.

2. The herein described process of treatment of clay chalkror marking and other purposes, which consists in soaking it in machine oil, and thereafter permitting the same to dry.

3. The herein described process of treating chalk for marking and other purposes, which consists in soaking it in machine oil to the point of saturation, and thereafter removing the chalk and permittingit to dry.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN N. SI-IYMANSKI.

Witnesses:

W. W. Hour, J N0. M. Rrr'rirn. 

